Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)
Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)
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DOI：
10.1080/00206814.2017.1393634
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发表时间：
2018-11
影响因子：
2.6
通讯作者：
A. Robertson;S. Kutterolf;Aaron Avery;A. Baxter;K. Petronotis;G. Acton;C. Carvallo;J. Schindlbeck
中科院分区：
文献类型：
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作者：
A. Robertson;S. Kutterolf;Aaron Avery;A. Baxter;K. Petronotis;G. Acton;C. Carvallo;J. Schindlbeck
摘要：新的生物地层学、地球化学和磁性证据与综合大洋钻探计划（IODP）352航次的船上结果相结合，以了解伊豆 - 小笠原外弧前区域的沉积和构造 - 岩浆发育情况。伊豆 - 小笠原弧前的洋壳基底是在始新世早期（约50 - 51百万年）由俯冲带上的海底扩张形成的。海底扩张造就了不规则的海底地形，局部堆积了岩屑堆。通过热液和远洋沉积物的混合，富氧化物的沉积物堆积在火成岩基底之上。玄武质火山活动之后，由于地形隔离或沉积物绕流，出现了长达1500万年的沉积间断。在渐新世到早中新世以及从中新世中期到更新世期间，沉积了不同程度含凝灰岩的深海沉积物。这些沉积物汇聚到伸展断层控制的盆地中，而浓缩的沉积物则堆积在局部的基底高地之上。渐新世的颗石藻软泥与主要来自附近伊豆 - 小笠原弧的长英质凝灰岩一起堆积。含放射虫的泥、粉质粘土和水成金属氧化物在碳酸盐补偿深度（CCD）以下的堆积是早中新世的特征，随后在中新世中期 - 更新世期间，碳酸盐保存增加，CCD加深，并且有来自伊豆 - 小笠原大洋弧和本州大陆边缘弧的火山灰输入。伊豆 - 小笠原弧前基底是在近赤道环境下形成的，其西侧有中生代晚期的弧残留。俯冲起始岩浆作用可能发生在先前存在的大陆 - 洋壳边界附近。伊豆 - 小笠原弧向北和顺时针迁移，到早中新世时与本州碰撞，强烈影响了区域沉积作用。
ABSTRACT New biostratigraphical, geochemical, and magnetic evidence is synthesized with IODP Expedition 352 shipboard results to understand the sedimentary and tectono-magmatic development of the Izu–Bonin outer forearc region. The oceanic basement of the Izu–Bonin forearc was created by supra-subduction zone seafloor spreading during early Eocene (c. 50–51 Ma). Seafloor spreading created an irregular seafloor topography on which talus locally accumulated. Oxide-rich sediments accumulated above the igneous basement by mixing of hydrothermal and pelagic sediment. Basaltic volcanism was followed by a hiatus of up to 15 million years as a result of topographic isolation or sediment bypassing. Variably tuffaceous deep-sea sediments were deposited during Oligocene to early Miocene and from mid-Miocene to Pleistocene. The sediments ponded into extensional fault-controlled basins, whereas condensed sediments accumulated on a local basement high. Oligocene nannofossil ooze accumulated together with felsic tuff that was mainly derived from the nearby Izu–Bonin arc. Accumulation of radiolarian-bearing mud, silty clay, and hydrogenous metal oxides beneath the carbonate compensation depth (CCD) characterized the early Miocene, followed by middle Miocene–Pleistocene increased carbonate preservation, deepened CCD and tephra input from both the oceanic Izu–Bonin arc and the continental margin Honshu arc. The Izu–Bonin forearc basement formed in a near-equatorial setting, with late Mesozoic arc remnants to the west. Subduction-initiation magmatism is likely to have taken place near a pre-existing continent–oceanic crust boundary. The Izu–Bonin arc migrated northward and clockwise to collide with Honshu by early Miocene, strongly influencing regional sedimentation.